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Investment securities - Unrealized losses/fair value (Details 3) - CHF (SFr)
SFr in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Fair value, less than 12 months SFr 625 SFr 683
Fair value, 12 months or more 89 0
Fair value, total 714 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross unrealized losses, less than 12 months 100 8
Gross unrealized losses, 12 months or more 12 0
Gross unrealized losses, total 112 8
Corporate debt securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Fair value, less than 12 months 625 683
Fair value, 12 months or more 89 0
Fair value, total 714 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross unrealized losses, less than 12 months 100 8
Gross unrealized losses, 12 months or more 12 0
Gross unrealized losses, total 112 8
Bank    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Fair value, less than 12 months 625 683
Fair value, 12 months or more 89 0
Fair value, total 714 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross unrealized losses, less than 12 months 100 8
Gross unrealized losses, 12 months or more 12 0
Gross unrealized losses, total 112 8
Bank | Corporate debt securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Fair value, less than 12 months 625 683
Fair value, 12 months or more 89 0
Fair value, total 714 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross unrealized losses, less than 12 months 100 8
Gross unrealized losses, 12 months or more 12 0
Gross unrealized losses, total SFr 112 SFr 8